To post pieces of code, surround them with <code>...</code> tags. For PHP code, you can use <?php ... ?>, which will also colour it based on syntax.

Internal paths in single or double quotes, written as "internal:node/99", for example, are replaced with the appropriate absolute URL or path. Paths to files in single or double quotes, written as "files:somefile.ext", for example, are replaced with the appropriate URL that can be used to download the file.

Filtered words will be replaced with the filtered version of the word.